[8u] [RFR] JDK-8272214: Build failure after backport of JDK-8248901

[Andrew Hughes]

Bug: https://bugs.openjdk.java.net/browse/JDK-8272214
Webrev: https://cr.openjdk.java.net/~andrew/openjdk8/8272214/webrev.01/

The backport of JDK-8248901 introduced the use of the INT64_C and
UINT64_C macros from stdint.h to create constants of 64-bit types.

In C99, it was required that these macros only be defined in C++ when
__STDC_CONSTANT_MACROS was defined. This requirement was dropped with
C11. Older versions of glibc conform with C99 and only define them
when this __STDC_CONSTANT_MACROS is defined.  Newer versions conform
with C11 and always define them [0], which is why the build only fails
on older platforms.

I presume the case is similar for Windows, but I don't have such an
environment to check. Severin has confirmed that defining
__STDC_CONSTANT_MACROS does fix the build on both platforms. [1]

Ok for 8u-dev?

[0] https://sourceware.org/bugzilla/show_bug.cgi?id=15366
[1] https://mail.openjdk.java.net/pipermail/jdk8u-dev/2021-August/014175.html
-- 
Andrew :)
Pronouns: he / him or they / them
Senior Free Java Software Engineer
OpenJDK Package Owner
Red Hat, Inc. (http://www.redhat.com)

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